27 lines
363 B
ArmAsm
27 lines
363 B
ArmAsm
.define Tle
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.sect .text
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.sect .rom
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.sect .data
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.sect .bss
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.sect .text
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! This subroutine tests if the value in registerpair AX is
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! less than or equal to zero.
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! The value returned is in AX.
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Tle:
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tay
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bpl 1f ! A >= 0
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3: lda #0 ! AX <= 0
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ldx #1
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rts
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1: beq 1f ! A = 0
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2: lda #0 ! AX > 0
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tax
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rts
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1: txa
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bne 2b ! X > 0
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beq 3b ! x = 0
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